印刷ループ数
1828 ワード
public class LoopPrinter {
/**
*
*
* @param row
*
* @param col
*
* @return
*/
public static int[][] loopArray(final int row, final int col) {
int[][] array = new int[row][col];
int maxCount = row * col;
int count = 1;
int less = row < col ? row : col;
int loopLimit = less / 2; //
if (less % 2 > 0) {
if (row == col) {
array[loopLimit][loopLimit] = maxCount;
}
loopLimit++;
}
for (int loop = 1, i = 0, j = 0; loop <= loopLimit; loop++, i++, j++) {
for (; j < col - loop; j++) {
array[i][j] = count++;
}
for (; i < row - loop; i++) {
array[i][j] = count++;
}
for (; j > loop - 1 && count <= maxCount; j--) {
array[i][j] = count++;
}
for (; i > loop - 1 && count <= maxCount; i--) {
array[i][j] = count++;
}
}
return array;
}
/**
* @param args
*/
public static void main(String[] args) {
int row = 6;
int col = 5;
long nano = System.nanoTime();
int[][] array = loopArray(row, col);
System.out.println(" :" + (System.nanoTime() - nano) + " ns");
for (int i = 0; i < array.length; i++) {
for (int j = 0; j < array[i].length; j++) {
System.out.print(array[i][j] + "\t");
}
System.out.println();
}
}
}
:
int row=6, col=5;
1 2 3 4 5
18 19 20 21 6
17 28 29 22 7
16 27 30 23 8
15 26 25 24 9
14 13 12 11 10